Department of Pediatric Dentistry, Orthodontics and Community Dentistry, Discipline of Pediatric Dentistry, Bauru School of Dentistry, University of São Paulo; Bauru, Brazil.
Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo; Bauru, Brazil.
Braz Dent J. 2023 Dec 22;34(5):36-42. doi: 10.1590/0103-6440202305372. eCollection 2023.
Evaluate the shaping ability and preparation time using a pediatric motor-driven rotary instrumentation compared to other systems in resin prototypes of primary molars.
Thirty specimens were scanned in micro-CT and divided into three groups according to the instrumentation type: pediatric motor-driven Sequence baby File (SBF); conventional motor-driven (Sequence Rotary File - SRF); manual K file. Instrumentation time was timed. After preparation, the specimens were scanned again. The pre- and post-instrumentation images were superimposed to measure the amount of root canal deviation and the resin remnant thickness. ANOVA followed by the Tukey test analyzed the comparisons between groups (p<0.05).
No statistically significant differences occurred in root canal deviation among groups (p>0.05). There were statistically significant differences in the comparison among root thirds (p<0.001) but without significant differences in the interaction group vs. root third (p>0.05). Both motor-driven instrumentations showed statistically greater weariness than manual instrumentation (p<0.001), without significant significant differences between SBF and SRF. Motor-driven instrumentation had a shorter working time than manual instrumentation (p<0.001).
Pediatric motor-driven instrumentation demonstrated good outcomes in relation to root canal deviation and amount of remnant structure, with shorter instrumentation time. SBF can be a suitable alternative for endodontic instrumentation in primary molars.
评估儿童马达驱动旋转器械与其他系统在乳磨牙树脂原型中的成形能力和准备时间。
将 30 个样本进行微 CT 扫描，并根据器械类型分为三组：儿童马达驱动 Sequence baby File（SBF）；常规马达驱动 Sequence Rotary File - SRF；手动 K 锉。记录器械使用时间。准备完成后，再次对样本进行扫描。将预备前后的图像叠加，测量根管偏移量和树脂残留厚度。采用方差分析（ANOVA）和 Tukey 检验对组间比较进行分析（p<0.05）。
各组间根管偏移量无统计学差异（p>0.05）。根管的不同部位间有统计学差异（p<0.001），但组间与根管部位间无显著交互作用（p>0.05）。与手动器械相比，两种马达驱动器械的疲劳感均显著增加（p<0.001），但 SBF 和 SRF 之间无显著差异。马达驱动器械的工作时间明显短于手动器械（p<0.001）。
儿童马达驱动器械在根管偏移量和残留结构量方面表现出良好的效果，且器械准备时间更短。SBF 可作为乳磨牙牙髓器械的替代选择。
